What is it about?
The implementation of a novel, cost-effective PVDF piezo-film sensor array for unsteady wall-pressure measurements in supersonic flows is introduced. With this type of technique, multiple local pointwise measurements can be taken simultaneously from a single thin foil without disturbing the flow field. The paper presents a detailed explanation of the design of the sensor array and of its signal conditioning system. The sensor array is tested in a turbulent incident shockwave/boundary layer interaction (SBLI) at Mach 2 and validated through favorable comparison with a classical Kulite piezoresistive transducer. The results of unsteady wall-pressure measurements also show good agreement with other SBLI studies already presented in the literature.
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Why is it important?
Our work showed that the piezo-film sensing technique can be successfully used in a supersonic flow for unsteady wall-pressure measurements. One of the main advantage of this technique is the possibility of creating custom patterns of sensors from a single flexible foil . So we are capable of acquiring surface measurements at a fraction of the price of standard pressure transducers, with high frequency response and high spatial resolution inside a low intrusiveness packaging.
Perspectives
I hope this article will spark interest in this new technique. Indeed I think that piezo electric foils are very promising and probably not only for fluid-dynamic research.
Cosimo Corsi
Technische Universitat Berlin
It’s a compact smart sensor surface through the integration of piezoelectrical sensor foil and electronic components using vertical integration technology. The sensor foil is in parallel to the flow direction. Other electronic components are embedded or integrated on the backside. This novel concept allows realization of flexible sensor array which can be integrated on different 3D surfaces as flush-mounted and will have no out-standing or deepened structures that interfere with the boundary layer, and so disturbances can be avoided. Our presented system provides robust sensor solution for higher temporal and spatial resolutions exceeding the state-of-the-Art.
Ha Duong Ngo
University of Applied Sciences Berlin
Read the Original
This page is a summary of: Development of a PVDF Piezo-Film Sensor Array for Unsteady Wall-Pressure Measurements in a Turbulent SBLI, June 2022, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2022-4135.
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